This archive contains the raw maps and the SNR maps for the M2-ACT survey for point sources in clusters.� For details of the survey see: https://arxiv.org/abs/2403.09855

(1) A list of survey targets and the noise level that was achieved can be found in tab1.txt (table 1 in the above paper).

(2) Fits files ending in _map.fits contain the raw maps made by the MIDAS data pipeline.� The primary header of the file contains the map and the second header contains a weight map representing the coverage.� The reduction parameters are in the header of the files but a summary of the map-making steps is as follows :��- MIDAS is a filter and bin map maker.
�- Time ordered data (TOD) are read in and calibrated to Jy/beam using observations of known point sources taken every 20 to 40 minutes during observations.� At 90 GHz the GBT beam shape varies with time (hence so does the calibration).� Interpolation between each calibration observation to each individual cluster observation is carried out.�- A 0.05Hz high pass and 49 Hz lowpass filter are applied to the TODs.� These values were found not to affect the amplitudes of point sources injected into the maps.
�- After calibration has been applied, cuts are made of known bad detectors.�- Further cuts are made, flagging and fixing jumps and spikes in the TODs�- A common mode is calculated from the remaining data and subtracted from the TODs.�- Weights are calculated for each pixel based on their standard deviation (as the TODs are noise dominated).
�- A simple nearest neighbor map maker is used to construct a signal maps.�- A noise map was made by inverting the signs of the second half of each TOD and remaking the map.�

(3) Fits files ending in _filtsnr.fits are signal to noise (SNR) maps made by convolving the signal maps with a double gaussian with a central width of 8.5" FWHM and an outer width of 32" FWHM.� When carrying out the convolution the weight map is used to downweight areas of the maps with lower coverage.� The noise in the convolved maps is then calculated and SNR maps made taking into account the convolved weight map.� The second extension of these fits files contains an estimation of the noise as a function of position.� However this noise is not absolute as it does not take into account the transfer function of the double gaussian on a point source.

(4) If there are any questions please contact Simon Dicker at sdicker@hep.upenn.edu (or any of the other MUSTAT2 team.� Other data products such as raw tods can be made available on request.
